Running jython via Nailgun server

Wrapper.java

package com.github.vanuan.jython.nailgun;

import java.util.Arrays;

import org.python.core.Py;
import org.python.core.PyList;
import org.python.core.PySystemState;
import org.python.core.PyType;
import org.python.util.PythonInterpreter;

import com.martiansoftware.nailgun.NGContext;

public class Wrapper {

    private static PythonInterpreter interpreter = null;

    public static void nailMain (NGContext context) {

        if (interpreter == null) {
            interpreter = new PythonInterpreter();
        } else {
            Py.setSystemState(new PySystemState());
        }

        PySystemState systemState = interpreter.getSystemState();
        systemState.setCurrentWorkingDir(context.getWorkingDirectory());
        interpreter.setErr(context.err);
        interpreter.setIn(context.in);
        interpreter.setOut(context.out);
        systemState.argv = new PyList(PyType.fromClass(String.class), Arrays.asList(context.getArgs()));

        String pythonPath = System.getProperties().getProperty("python.path");
        if (pythonPath != null) {
            String[] tokens = pythonPath.split(context.getPathSeparator());
            systemState.path = new PyList(PyType.fromClass(String.class), Arrays.asList(tokens));
        }

        interpreter.execfile(context.getArgs()[0]);
    }

}